An integrated biological process for cellulosic bioproduct production is provided, which, in one embodiment, results in high ethanol productivity, enzyme recycling and reuse of yeast cells. The integrated process can be an integrated separate hydrolysis and fermentation (SHF) process or an integrated fast simultaneous saccharification and co-fermentation (FSSCF) process. The methods described herein can result in high bioproduct productivity through enzyme recycling and reuse of yeast cells.
STATEMENT OF GOVERNMENT RIGHTS
 This invention was made with government support under DE-FCO2-07ER64494 awarded by the U.S. Department of Energy. The government has certain rights in the invention.